[Qemu-devel] [PATCH 13/24] cirrus: wrap memory update in a transaction

[Avi Kivity <avi@redhat.com>]

This prevents spurious unmapping and remapping of the vga windows,
which reduces performance.

Signed-off-by: Avi Kivity <avi@redhat.com>
---
 hw/cirrus_vga.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/hw/cirrus_vga.c b/hw/cirrus_vga.c
index 4d0ef0d..ec7ea82 100644
--- a/hw/cirrus_vga.c
+++ b/hw/cirrus_vga.c
@@ -2424,6 +2424,7 @@ static void cirrus_update_memory_access(CirrusVGAState *s)
 {
     unsigned mode;
 
+    memory_region_transaction_begin();
     if ((s->vga.sr[0x17] & 0x44) == 0x44) {
         goto generic_io;
     } else if (s->cirrus_srcptr != s->cirrus_srcptr_end) {
@@ -2443,6 +2444,7 @@ static void cirrus_update_memory_access(CirrusVGAState *s)
             unmap_linear_vram(s);
         }
     }
+    memory_region_transaction_commit();
 }
 
 
-- 
1.7.5.3